Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee682e40e86d0d20…

MALICIOUS

PDF

181.9 KB Created: 2021-07-06 23:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 469a1bc6ff4011bf51bfde420b984698 SHA-1: 232486ea0513e004784133ca9063467a87b19ed9 SHA-256: ee682e40e86d0d20bee0944ce27c9b0d52999a37695f5e4190451e4f0dd7f9f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm hosted on compromised CMS sites, with numerous URLs pointing to PDF files. While no scripts were extracted, the presence of these links suggests an intent to redirect users to malicious or phishing content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9678

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c7254f45540---58900969449.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881b900053e---85564195813.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839ca4b7675---lixexexikowezazunofodazeb.pdf
    • https://euinsuti.ro/app/webroot/files/userfiles/files/25827831400.pdf
    • http://mygiftltd.com/userfiles/file/dotesomiporadu.pdf
    • https://weeb.nu/userfiles/file/gopeluwubuwa.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/4e195b1266bf3f1a846a79d8aad509e8/85018225696.pdf
    • http://xn--aknmedikal-yub.com/uploads/file/lofipexasegoviborigaf.pdf
    • http://espacioschillout.es/images/admin/file/83727875662.pdf
    • https://leo.tw/upload/ckeditor/files/23494041251.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68c680638f---65752330605.pdf
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/xalisowaziw.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/81c27b0aabc25300b2957d6e470dd6e2/divunuxeguzapi.pdf
    • http://bulmarconsult.com/files/90692392089.pdf
    • https://aduanaldelvalle.com/userfiles/file/15475974539.pdf
    • http://majorpropertygroup.com/userfiles/files/93390878022.pdf
    • http://www.cavice.fi/tiedostot/files/sovumem.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a604c8ae845---29947756054.pdf
    • http://guojingmall.com/userfiles/file///kugobegukidasumixixixu.pdf
    • http://faw-asia.com/image/upload/files/49809716038.pdf
    • https://alarouba.com/ckfinder/userfiles/files/72645064962.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b3e06e7f3---noxediro.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/fe5bd88225cfee62ab3d4395ba658918/21957044261.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=words+power+made+easy+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f820.bin
f2edc11aa52b50338ef79b51df73ae020fe4ba282b72455adecd4e387c057c17
pdf-font-stream PDF embedded font (sfnt) at offset 0xF820 18444 bytes
font_01_sfnt_off000128db.bin
dd4600ebdfb4ac31ecaa60189ab0d0b3793d17d8fdd6699f7b16bb19327c0c82
pdf-font-stream PDF embedded font (sfnt) at offset 0x128DB 149308 bytes
font_02_sfnt_off0002976e.bin
ab5b314fbde8691e4e3451b051c7b807577d70dadd780c5217922b239ae82451
pdf-font-stream PDF embedded font (sfnt) at offset 0x2976E 10512 bytes
font_03_sfnt_off0002af71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2AF71 16792 bytes